Abstract: In the logging of a grade characteristic of a borehole core, the core is placed in a trough which is caused to move, in step fashion, through an annular detector. For each step the detector measures a characteristic of a notional segment of the core. The measures are corrected to compensate for contributions due to adjacent notional segments. The correction factor is derived by passing a core segment of known characteristics through the detector under controlled conditions.

Abstract: A method of and apparatus for detecting a characteristic in particulate material wherein a stream of the material is caused to move past a plurality of detectors, each of which is responsive to the characteristic, the detectors being so arranged in relation to the material stream that the combined response of the detectors for a given particle possessing the characteristic is substantially independent of the position of the particle relative to the detectors as it passes the detectors.

Abstract: A method of eliminating errors in the radiation count of a scintillation detector in radiometric sorting caused by one or more adjacent particles. The spacing between the adjacent particles are determined, and statistically determined calibration factors are applied to the count to compensate for the adjacent particles. The calibration factors are dependent upon the spacings, the counts associated with the adjacent particles, and optionally on the shape, volume, mass and height of the adjacent particles.

Abstract: A method of and apparatus for measuring radio-active emissions from moving radio-active material.Use is made of a radiation detector, a first radiation shield of a first material which shields the detector, and a second radiation shield which is located between at least a portion of the first shield and the detector.The material of the second shield is inherently less contaminated and emits secondary excitation radiation of lower energy than the first material.

Abstract: For measuring the volume of a particle, for example in ore sorting, the particle is caused to move past radiators which illuminate the particle in two transverse directions. Detectors provide measures of the dimensions of the particle in the transverse directions in each of a number of adjacent zones which extend through the particle in its direction of movement. For each zone a volume measurement is derived from the product of the dimensional measurements and the various volume measurements are accumulated to obtain the final volume measurement.The dimensional measurements may be made in each zone in four or more transverse directions, and may be made by means of scanning cameras to obtain a more accurate final volume measurement.

Abstract: A method of determining the grade of a radioactive ore particle wherein a grade measurement of the particle e.g. the ratio of its radioactivity to its mass is corrected by means of predetermined calibration factors which are dependent on one or more of the shape, size, density or mass of the particle.

Abstract: In radiometric sorting a method of compensating for the count recorded by a detector for an ore particle which is displaced from the center line of the detector. The compensation is effected by applying one of a plurality of calibration factors to the detector count. The calibration factors are statistically determined and are dependent on the measured displacement and optionally on at least one of the shape, height, volume or mass of the particle.